The Pacific HVDC Intertie has undergone major expansions and rebuildings. At the beginning of the 1960s, major hydropower resources were being exploited on the Columbia river in the north-western United States. The Federal authorities, which own the power resources in the north, were able to offer electricity at rates so far below the production costs in Los Angeles as to make long-distance transmission economical. At that time ABB had already completed a number of HVDC projects, having developed the technology over several decades. The US authorities were consequently interested in introducing this technology in the USA. Link to: Overview of the AC/DC Pacific Intertie Over the years ABB has been heavily involved in the Pacific HVDC Intertie from the first contact in 1965. The Pacific HVDC Intertie has undergone major expansions and rebuildings. The latest one was put in service in 2004.